Combined check and cut-off valve.



H. F. LAUBACH.

COMBINED CHECK AND CUT-OFF VALVE.

APPLICATION FILED MAR. 20. IBM- Patented Jan. 21, 1919.

2 SHEETS-SHEET I.

H. F. LAUBACH.

COMBINED CHECK AND CUT-OFF VALVE.

APPLICATION FILED MAR. 20. 19!]- 1 ,291,939. Patented Jan. 21, 1919.

2 SHEETS-SHEET 2.

awuewboz J amt/mugs PATENT OFFICE.

HIRAM F. LAUBACH, 0F TACOMA, WASHINGTON.

COMBINED CHECK AND CUT-OFF VALVE.

Specification of Letters Iatent.

Patented Jan. 21-, 1919.

Application filed March 20, 1917. Serial No. 156,156.

To all whom it may concern:

Be it knownthat I, HIRAM F. LAUBACH, a citizen of the United States,residin at Tacoma, in the county of Pierce and tate of Washington, haveinvented certain new and useful Improvements in Combined Check andCut-Oil Valves, of which the following is a specification.

This invention relates to steam boiler valves and more particularly toan improvement in valves such as are employed for the purpose ofcontrolling the supply of feed water to the boiler. Such valveordinarily embody a check valve and it has been proposed to interposebetween the check valve and the outlet from the valve casing a cutoffvalve so that in the event of in'ury to the check valve or in theevent-that it becomes necessary to regrind the valve and its seat, thecut-off valve might be closed thereby permitting of the safe removal ofthe check valve for the purpose stated. While by reason of the provisionof the cut-off valve it becomes unnecessary to kill the engine untilafter the check valve has been repaired and replaced, nevertheless itwould not be practical to supply feed water to the boiler before thesaid check valve had been replaced. The present invention, therefore,aims to provide a double valve of this class, the same comprisin adouble casing having a single outlet to t e boiler and two inlets, therebeing a cut-off valve and a check valve interposed between each inletand the outlet and the two sets of valves being independent so that inthe event of injury to one of the check valves and the injury is suchthat it would be impracticable to replace the valve before it becamenecessary to again supply feed water to the boiler, the correspondingcut-off valve might be closed and the other cut-oil valve then opened soas to permit of feed water being supplied past the other check valve.

It is also desirable at times to expedite the suppl ing of feed water tothe boiler and, there ore, another object in view in providing a doublevalve of this class is to permit of feed water being supplied throughboth branches of the casing simultaneously.

In the accompanying drawings:

Fi re 1 is a. vertical longitudinal sectiona view through one form ofvalve embodying the present invention;

Fig. 2 isa similar view through another form of the invention.

Briefly stated, the valve casing is pro vided with an outlet to theboiler and at each side of the outlet with a cut-off valve chamber and acheck valve chamber and inasmuch as the two forms of the invention shownin the drawings are substantially 7 identical so far as details ofstructure are concerned, corresponding parts in the two figures areindicated by corresponding reference numerals, the chief differencebetween the two forms ,being that in one instance the cut-off valvechambers are horizontally disposed, whereas in the other instance theyare vertically disposed. The valve chamber is indicated in general bythe numeral 1 and i provided with an outlet port 2 leading to theboiler. An intermediate passage 3 is in communication with the port 2and with both of the -cutofl" valve chambers and in that form of theinvention shown in Fig. 1 of the drawings the cut-off valve chamberswhich are indicated by the numeral 4 extend laterally in oppositedirections from the passage 3 with their axes horizontally disposed andin alinement. A plug 5 is threaded into the outer end of each chamber 4and is formed with a threaded bore 6, the plug being provided at itsouter end with a packing gland 7 and the stem of the cut-off valve,indicated by the numeral 8, being rotatably fitted through the saidgland and being provided with a threaded portion'9 adjustably fittingwithin the bore 6. At its outer end each stem is provided with asuitable handle 10 and at its inner end with a valve head 11 designed tobe adjusted toward and from its seat 12 through rotation of the saidstem. In that form of the invention shown in Fig. 1 in which form thecut-ofi" valve chambers are horizontallv disposed, the valve seats 12are formed at the opposite ends of the passage 3 whereas in the formshown in Fig; 2 of the drawings, in which form the said outofl valvechambers are vertically disposed, the said seats 12 are located at thelower ends of the said cut-ofi' valve chambers substantially in a planewith the lower side of the port 2. In either event, however,when bothcut-ofi' valves 11 are closed no feed water can enter the passage 3 andpass to the boiler although either valve may be opened for this purpose,or, both may be opened to permit passage of feed water simultaneouslythrough the two branches of the casing.

In both forms of the invention the check valve chambers are verticallydisposed and in each instance each chamber comprises a fixed section 13in the nature of a cylindrical downward extension from the underside orlower end of the corresponding cutoff valve chamber in Figs. 1 and 2,respectively, there being a port or passage 14: establishingcommunication between the fixed section 13 of each check valve chamberand the corresponding cut-0E valve chamber. Each check valve chamberfurther includes a removable section 14' interiorly cylindrical andprovided exteriorly near its upper end with an annular shoulder 15which, at its upper side, abuts against the lower end of the respectivesection 13 a collar 16 being threaded on to each section 13 and beingprovided at its lower end interiorly with an annular-shoulder 17engaging; the underside of the shoulder 15. The lower ends of the checkvalve chamber sections 14: are threaded, as at 18, either exteriorly, asshown in Fig. 1, or interiorly, as shown in Fig. 2, for the connectionof the feed water supply pipe (not shown). Interiorly, however, eachsection 14' is smooth at its upper end to rotatably receive the stem ofthe respective check valve, the stem being indicated by the numeral 19and being provided with spiral or oblique wings 20 which, when actedupon by the feed water entering the valve casing, impart rotary motionto the check valve. The head of the check valve is indicated by thenumeral 21 and the underside thereof is smoothly ground so as to coactwith a raised valve seat 22 surround- 1,2er,ese

movement of the check valve, an abutment 23 is located within the upperend of the sec-. tion 13 of each check valve chamber and is supported byintegral spider arms 24.

From the foregoing description of the invention it will be understoodthat either or both of the cut-off valves may be opened to admit feedwater to the boiler and that in the event of injury to either one of thecheck valves, the corresponding cut-ofi' valve may be closed after whichthe said check valve'may be removed and repaired or replaced. It willalso be understood that the removal of either check valve does notnecessitate killing the locomotive inasmuch as the feed water may beintroduced into the valve casing through the other check valve chamber.

Having thus described the invention, what is claimed as new is:

In a valve, a casing having an outlet and provided with cut-ofi valvechambers disposed on opposite sides of the outlet, there eing anunobstructed passage extending in a straight line between the outlet andvalve chambers and establishing direct communication therebetween, acut-oii valve arranged Within each of said chambers, a check valvechamber in communication with each of the cut-off valve chambers, and acheck valve in each of said check valve chambers.

In testimony whereof I affix my signature.

HIRAM r. LAUBACH. a. 5.

ing the upper end of the bore of the sec;\ tion 14. In order to limitthe opening

